High-Entropy Titanium-Aluminum Diffusion Coatings on Nickel Alloy

Khyzhniak, V G; Loskutova, T. V.; Datsyuk, O. E.; Pohrebova, I. S.; Kharchenko, N. A.; Говорун, Тетяна Павлівна; Dehula, Andrii Ivanovych; Smokovich, I. Ya.; Kravchenko, Yaroslav

doi:10.1615/hightempmatproc.2017019326

Cited by 2 publications

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“…It is known that the diffusion of nitrogen in Ti alloys generates usually a continuous TiN or Ti 2 N nitride layer and nitrogen‐rich α‐Ti solid solution . These nitride layers may act as barrier layers, which can inhibit titanium supply from the substrate to the surface reducing the ability of a brittle TiO 2 layer appearance during an oxidation exposure . As Al is an α‐stabilizer in titanium alloys, its accumulation and diffusion from alloy's substrate and dissolution in α‐Ti in the result of the thermal treatment are known, (see light pink stripe beneath the coating, Figure )…”

Section: Resultsmentioning

confidence: 99%

“…[49][50][51][52] These nitride layers may act as barrier layers, which can inhibit titanium supply from the substrate to the surface reducing the ability of a brittle TiO 2 layer appearance during an oxidation exposure. [53] As Al is an α-stabilizer in titanium alloys, its accumulation and diffusion from alloy's substrate and dissolution in α-Ti in the result of the thermal treatment are known, (see light pink stripe beneath the coating, Figure 7). [54] The obtained coating layers were continuous across the entire samples' cross-section, and their average thickness achieved 30 AE 5 μm.…”

Section: Sem Investigations and Edx Analysismentioning

confidence: 99%

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New‐Type Oxidation Barrier Coatings for Titanium Alloys

Smokovych

Scheffler

et al. 2020

Adv Eng Mater

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Herein, a new type of oxidation protection coating for Ti alloys is developed based on a perhydridopolysilazane preceramic polymer and particulate AlB 2 , Si, B, and Ti 3 AlC 2 (so-called MAX phase) fillers; MAX phases are used due to their high temperature and corrosion resistance, thermal shock resistance, and self-healing capability. For coating consolidation, the as-coated samples are pyrolyzed in argon or nitrogen and exposed to air at 800 C for up to 100 h. Although coatings containing AlB 2 or elemental Si and B show a small mass gain in the initial state of exposure to air and after no mass gain up to 100 h, MAX phase-loaded samples show a significant mass gain up to 7 h of exposure and a sudden mass decrease, which corresponds to coating layer spallation. The mechanisms leading to oxidation protection in AlB 2-filled systems are explained with an alumina layer formation and a glass formation from the preceramic polymer. In Si-and B-filled systems, a borosilicate glass phase may be able to reduce the oxygen diffusion capability and the MAX phases as fillers need further investigations; they may cause thermally induced mechanical stresses in the protective coatings.

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Section: Resultsmentioning

confidence: 99%